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Events Calendar

EVENTS IN October 2017

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Thursday, October 5, 2017

4:00 PM - 5:00 PM

NUTC Seminar / Sandhouse Event: "Civil Engineering & Design of the WIlson & 95th Street Stations" - Chris Bushell, CTA

Northwestern University Transportation Center &; NUTC's Sandhouse Rail Group present:

"Civil Engineering &; Design of the Wilson &; 95th Street Stations"

Chris Bushell
Vice President, Chicago Transit Authority

 

 

Contact Info: Diana Marek

Location: Chambers Hall 600 Foster St Lower Level Evanston IL 60208

Event URL: http://www.transportation.northwestern.edu/

Thursday, October 12, 2017

4:00 PM - 5:15 PM

NUTC Seminar: "Efficiency from User-driven Service Order Adjustments in Collaborative Consumption of Supply in Transportation" - R. "Jay" Jayakrishnan

Northwestern University Transportation Center presents:

"Efficiency from User-driven Service Order Adjustments in Collaborative Consumption of Supply in Transportation"

R. "Jay" Jayakrishnan
Professor, Department of Civil and Environmental Engineering &; Institute of Transportation Studies, University of California at Irvine

 

ABSTRACT:

Newer technologies and high market penetration of personal communication systems along with the advent of autonomous and connected vehicle systems bring up many new possibilities for different paradigms of operation in transportation systems. Facilitated by significantly more peer-to-peer (P2P) communication, users in the future can consume transportation supply with more complete information on individual heterogeneity in utility satisfaction. Several possibilities exist in such a world of shared economy, with regard to using road and vehicle space in a temporally efficient manner. Breaking the traditional First-Come-First-Served paradigms with P2P monetary exchanges to compensate for utility disparities can improve system and user level efficiency. Car-sharing and ride-sharing are two of the more well-known systems of relevance. Autonomous vehicles bring up another dimension in terms of shared ownership as well. There is also recent research in collaborative negotiated consumption of other elements of transportation supply such as signal timings, and lane space availability. This presentation focuses on the possibilities, and discusses recent research into such mechanisms for signal and lane usage, and ride-matching in shared-ride systems. It also describes the associated pricing and behavioral issues where economic concepts such as envy-freeness are introduced as a basis for such schemes to be user-driven and equitable, without system level mandates.

 

SPEAKER BIO:

Prof. R. Jayakrishnan has been in the faculty of Civil and Environmental Engineering at the University of California at Irvine since 1991, after receiving his doctorate from the University of Texas at Austin. His research interests are in a variety of topics such as Traffic Flow Theory and Simulation, Transportation Systems Analysis, Network Modelling, Decision Theory, Intelligent Transportation Systems and Public Transit Design. Prof. Jayakrishnan has been a member of several professional committees, has served in the editorial committees of journals such as the ASCE Journal of Transportation Engineering and Transportation Research Part-C, and has served in several committees of the Transportation Research Board. He was a chair of the TRB subcommittee on Route Choice and Spatio-Temporal Processes. A paper co-authored by him received the Pyke Johnson Award for the best paper in planning submitted to the Transportation Research Board in 2009. Twenty doctoral students have graduated under his advice and he has over 100 refereed publications to his credit. He has been a visiting professor at other institutions such as the Ajou University in South Korea and the Amrita University in India.

 

Contact Info: Diana Marek

Location: Chambers Hall 600 Foster St Lower Level Evanston IL 60208

Event URL: http://www.transportation.northwestern.edu/

Thursday, October 26, 2017

4:00 PM - 5:15 PM

NUTC Seminar: "The Marginal Congestion of a Taxi in New York City" - Alejandro Molnar, Vanderbilt University

Northwestern University Transportation Center presents:

"The Marginal Congestion of a Taxi in New York City"

Alejandro Molnar
Assistant Professor, Department of Economics, Vanderbilt University

 

ABSTRACT:

We exploit the introduction of a new class of restricted taxi medallion in New York City to provide a causal estimate of the impact on congestion from the addition of taxis to the city. In August 2013 the City of New York introduced a restricted class of “boro” (or “green”) taxis. Boro taxis provide an equivalent service to that of “yellow” medallion taxis, but are restricted from pickups in Manhattan south of a boundary along East 96th St and West 110th St. We document a large spike in taxi cab activity north of the restriction boundary, driven entirely by entry from boro taxis and partially offset by retrenchment from traditional yellow medallion taxis, which face additional, localized competition. This variation allows us to study the effect of taxi supply on congestion: we construct a database of historical street-
level speed from taxi trip records by isolating the trips that consist of uptown or downtown “runs” along a North-South avenue, and projecting travel time onto street intervals. We find that the roll-out of the boro taxi program caused a localized 8% decrease in traffic speed. We then relate speed changes to taxi supply, by employing satellite and aerial orthoimagery to construct a novel data set of the location of taxis over time and space. We derive an empirical congestion curve between car speed and taxi activity.

[In progress: Additionally, we document a substantial slowdown in traffic speed throughout NYC since 2013, and are applying our estimate to attribute the share of this slowdown that can be explained by app-based rideshare providers.]

 

SPEAKER BIO:

Alejandro Molnar is an Assistant Professor of Economics at Vanderbilt University. His research focuses on market structure, competition and regulation in transportation and ecommerce industries. His dissertation research was on airline incentives in scheduling and a resulting "tragedy of the commons" outcome in the allocation of runway capacity at US airports. He received his PhD in Economics from Stanford University, and undergraduate degree from the Universidad de Buenos Aires.

Contact Info: Diana Marek

Location: Chambers Hall 600 Foster St Lower Level Evanston IL 60208

Event URL: http://www.transportation.northwestern.edu/